SNIIX18 Group Title If the period of a pendulum is 2.0 seconds and the acceleration due to gravity is 9.8 meters/second^2, What is the length of the cord on the pendulum? A)1.0 meters B)0.67 meters C)1.3 meters D)3.5 meters one year ago one year ago

1. SNIIX18 Group Title

can you help me

2. theEric Group Title

Are you speaking of a simple pendulum?

3. SNIIX18 Group Title

YES

4. theEric Group Title

Then you'll want the equation that uses math to describe the relationships between different physical quantities. I think I've show it to you before. I found it at http://hyperphysics.phy-astr.gsu.edu/hbase/pend.html It is:$T=2\pi\sqrt{\frac{L}{g}}$ $$T$$ is the period. $$L$$ is the length of the chord. $$g$$ is the acceleration caused by gravity. You want to solve for $$L$$.

5. SNIIX18 Group Title

OKAY HOLD ON

6. SNIIX18 Group Title

I GOT O.67 IS THAT RIGHT

7. theEric Group Title

It's not what I got! How did you solve for $$L$$?

8. SNIIX18 Group Title

I squared 2 then i divided 2.0 by 9.8

9. theEric Group Title

I'm confused... Can you show me what you got? You squared the 2?

10. SNIIX18 Group Title

now im confused cause your confused

11. theEric Group Title

Haha, you start with $T=2\pi\sqrt{\frac{L}{g}}$Now, what did you square?

12. SNIIX18 Group Title

owwww okay i see what i did wrong i was suppost to pi the 2 instead of square

13. theEric Group Title

Hmmm?

14. theEric Group Title

I would divide the equation by $$2\pi$$, square the equation, and multiply the equation by $$g$$, if you know what I mean. Then you have $$L$$ by itself after applicable cancelations, if you know what I mean.